CN104134426B - Pixel structure and driving method thereof, and display device - Google Patents
Pixel structure and driving method thereof, and display device Download PDFInfo
- Publication number
- CN104134426B CN104134426B CN201410321351.2A CN201410321351A CN104134426B CN 104134426 B CN104134426 B CN 104134426B CN 201410321351 A CN201410321351 A CN 201410321351A CN 104134426 B CN104134426 B CN 104134426B
- Authority
- CN
- China
- Prior art keywords
- transistor
- switching transistor
- storage capacitor
- light
- driving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03548—Sliders, in which the moving part moves in a plane
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0465—Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computer Hardware Design (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
The invention provides a pixel structure and a driving method thereof and belongs to the technical field of display so that a problem that the prior pixel structures are low in resolution can be solved. The pixel structure includes a plurality of pixel units and compensation units, wherein each pixel unit includes two adjacent circuits: a first pixel circuit and a second pixel circuit. Each first pixel circuit includes a first driving transistor and a first display device. Each second pixel circuit includes a second driving transistor and a second display device. Each first pixel circuit and a corresponding second pixel unit share one compensation unit and are controlled by the same data line. Each compensation unit is used for adjusting a grid voltage of a first driving transistor in a corresponding first pixel circuit so as to eliminate effects of a threshold voltage of the first driving transistor on a driving current of a corresponding first display device and used for adjusting a grid voltage of a second driving transistor in a corresponding second pixel circuit so as to eliminate effects of a threshold voltage of the second driving transistor on a driving current of a corresponding second display device.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a pixel structure, a driving method thereof and a display device.
Background
Organic light emitting display diodes (OLEDs) have been increasingly used in high performance displays as a current type light emitting device. The conventional Passive Matrix organic light emitting display (Passive Matrix OLED) requires a shorter driving time of a single pixel as the display size increases, and thus requires an increase in transient current and an increase in power consumption. Meanwhile, the application of large current can cause overlarge voltage drop on the ITO wire, and the working voltage of the OLED is overhigh, so that the efficiency of the OLED is reduced. The Active Matrix organic light emitting display (Active Matrix OLED) can well solve the problems by inputting OLED current through the line-by-line scanning of the switching tubes.
In the AMOLED backplane design, the main issue to be solved is the luminance non-uniformity from pixel to pixel.
Firstly, the AMOLED adopts a Thin Film Transistor (TFT) to construct a pixel circuit to provide corresponding current for the OLED device, wherein a low temperature polysilicon thin film transistor (LTPS TFT) or an Oxide thin film transistor (Oxide TFT) is mostly adopted. Compared with a common amorphous silicon thin film transistor (amorphous-Si TFT), the LTPS TFT and the Oxide TFT have higher mobility and more stable characteristics, and are more suitable for AMOLED display. However, due to the limitation of the crystallization process, LTPS TFTs fabricated on large-area glass substrates often have non-uniformity in electrical parameters such as threshold voltage, mobility, etc., which are converted into current difference and brightness difference of OLED display devices and perceived by human eyes, i.e., mura (undesirable) phenomenon. Although the Oxide TFT has good process uniformity, similar to the a-Si TFT, the threshold voltage thereof may shift under long-time pressurization and high temperature, and the threshold shift amount of the TFT of each portion of the panel may be different due to different display frames, thereby causing display luminance difference.
Second, in large-scale display applications, since the backplane power line has a certain resistance and the driving currents of all pixels are provided by the first reference voltage source VDD, the power in the backplane is close to the area of the first reference voltage source VDD where power is suppliedThe voltage is higher than the supply voltage in regions further away from the supply location, a phenomenon known as IR Drop. Since the voltage of the first reference voltage source VDD is related to the current, the IR Drop also causes the current difference in different regions, thereby generating mura in the display. The LTPS process for constructing a pixel unit using the P-Type TFT is particularly sensitive to this problem because the storage capacitor is connected between the first reference voltage source VDD and the gate of the driving transistor DTFT, and the gate-source voltage V of the driving transistor DTFT is directly affected by the voltage change of the first reference voltage source VDDgs。
Third, the non-uniformity of the electrical properties of the OLED device due to the non-uniform film thickness during evaporation. For an a-Si or Oxide TFT process for constructing a pixel unit by adopting an N-Type TFT, a storage capacitor is connected between a grid electrode of a driving TFT and an OLED anode, and when data voltage is transmitted to the grid electrode, if the anode voltage of each pixel OLED is different, the grid-source voltage Vgs actually loaded on the driving transistor DTFT is different, so that the display brightness difference is caused by different driving currents.
An AMOLED voltage type pixel unit driving circuit is provided in the prior art. The voltage type driving method is similar to the conventional AMLCD driving method, a voltage signal representing gray scale is provided by a driving unit, the voltage signal is converted into a current signal of a driving transistor in a pixel circuit, so that the OLED is driven to realize the brightness gray scale, the method has the advantages of high driving speed and simplicity in implementation, is suitable for driving a large-size panel and is widely adopted in the industry, but an additional switching transistor and a capacitor device are required to be designed to compensate the non-uniformity of the driving transistor DTFT, the IR Drop and the non-uniformity of the OLED.
Fig. 2 shows the most conventional circuit structure of a voltage-driven pixel unit cell (2T1C) with 2 TFTs and 1 capacitor. The switching transistor T transmits the voltage on the data line to the gate of the driving transistor DTFT, and the driving transistor converts the data voltage into a corresponding current to supply to the OLED device. The current can be expressed as:
wherein munFor carrier mobility, COXThe gate oxide capacitance is W/L, the transistor width-to-length ratio is Vdata, Voled is OLED working voltage and is shared by all pixel units, Vthn is the threshold voltage of the transistor, Vthn is a positive value for an enhanced driving transistor DTFT, and Vthn is a negative value for a depletion type TFT.
Although the prior art pixel cell driving circuit is widely used, it still has the following inevitable problems: if Vthn is different between different pixel cells, there is a difference in current. If Vthn of a pixel drifts with time, different sequential currents may be caused, which results in image sticking, and different OLED operating voltages due to non-uniformity of OLED devices may also result in current difference. In order to avoid the influence of Vthn difference between different pixel units on the pixel circuit, in the prior art, a threshold compensation unit is usually added to the pixel circuit to eliminate the influence of Vthn of the pixel on the pixel unit, but at the same time, as shown in fig. 1, each pixel structure in the pixel structure is arranged in rows and columns, and if one compensation unit is arranged in each pixel, the reduction of the pixel size is greatly limited due to the larger number of compensation units, that is, the larger number of thin film transistors and storage capacitors.
Disclosure of Invention
The technical problem to be solved by the present invention includes providing a pixel structure and a driving method thereof, which can improve resolution, in view of the above-mentioned problems of the existing pixel structure.
The technical solution adopted to solve the technical problem of the present invention is a pixel structure, including a plurality of pixel units and a compensation unit, wherein each pixel unit includes a first pixel circuit and a second pixel circuit which are adjacent to each other, and the first pixel circuit includes: a first driving transistor and a first display device; the second pixel circuit includes: a first driving transistor and a second display device; wherein the first pixel circuit and the second pixel circuit share the compensation unit and are controlled by the same data line;
the compensation unit is configured to adjust a gate voltage of a first driving transistor in the first pixel circuit to eliminate an influence of a threshold voltage of the first driving transistor on the driving current of the first display device, and adjust a gate voltage of a second driving transistor in the second pixel circuit to eliminate an influence of the threshold voltage of the second driving transistor on the driving current of the second display device. The pixel structure comprises a plurality of pixel units, each pixel unit comprises two pixel circuits, the two pixel circuits adjust the threshold voltage of a driving transistor in each pixel circuit through a compensation unit, namely, the two pixel circuits are controlled through a Data line Data, wherein each pixel circuit is equivalent to share one part of a sub-pixel unit in the technology, namely, two adjacent sub-pixels are controlled through the same Data line Data, the Data line Data in the conventional pixel structure can be halved, the compensation units are shared, and the number of thin film transistors in the compensation units can be reduced, so that the size of the pixel can be greatly reduced, the cost of a driving chip (IC) can be reduced, higher quality can be obtained, and higher resolution (PPI) can be obtained.
The present invention provides a driving method for a pixel structure, which is directed to the pixel structure, and specifically includes:
a threshold compensation stage: the compensation unit is used for adjusting the grid voltage of a first driving transistor in the first pixel circuit so as to eliminate the influence of the threshold voltage of the first driving transistor on the driving current of the first display device, and adjusting the grid voltage of a second driving transistor in the second pixel circuit so as to eliminate the influence of the threshold voltage of the second driving transistor on the driving current of the second display device.
Preferably, the compensation unit includes: the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, the seventh switch transistor, the eighth switch transistor, the ninth switch transistor, the tenth switch transistor, the first storage capacitor and the second storage capacitor; wherein,
the grid electrode of the first switch transistor is connected with the grid electrode of the second switch transistor, the grid electrode of the seventh switch transistor and the first light-emitting control line, the source electrode of the first switch transistor is connected with the source electrode of the second switch transistor and a first reference voltage source, and the drain electrode of the first switch transistor is connected with the source electrode of the fourth switch transistor and the source electrode of the first drive transistor;
the grid electrode of the second switching transistor is connected with the grid electrode of the eighth switching transistor, and the drain electrode of the second switching transistor is connected with the source electrode of the fifth switching transistor and the source electrode of the second driving transistor;
the grid electrode of the third switching transistor is connected with the grid electrode of the fourth switching transistor and the first scanning line, the source electrode of the third switching transistor is connected with the data line, and the drain electrode of the third switching transistor is connected with the second end of the first storage capacitor and the source electrode of the seventh switching transistor;
the drain electrode of the fourth switching transistor is connected with the first end of the first storage capacitor and the grid electrode of the first driving transistor;
the grid electrode of the fifth switching transistor is connected with the grid electrode of the sixth switching transistor and the second scanning line, and the source drain electrode is connected with the first end of the second storage capacitor and the grid electrode of the second driving transistor;
the source electrode of the sixth switching transistor is connected with the data line, and the drain electrode of the sixth switching transistor is connected with the second end of the second storage capacitor and the drain electrode of the eighth switching transistor;
a drain electrode of the seventh switching transistor is connected with a source electrode of the ninth switching transistor, a drain electrode of the first driving transistor DTFT1, and a first end of the first display device, and a second end of the first display device is grounded;
a drain electrode of the eighth switching transistor is connected to a source electrode of the tenth switching transistor, a drain electrode of the second driving transistor DTFT2, and a first terminal of the second display device, and a second terminal of the second display device is grounded;
the grid electrode of the ninth switching transistor is connected with the grid electrode of the tenth switching transistor and the second scanning line, and the drain electrode of the ninth switching transistor is grounded;
a drain of the tenth switching transistor is grounded.
Further preferably, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, the seventh switch transistor, the eighth switch transistor, the ninth switch transistor, the tenth switch transistor, the first drive transistor, and the second drive transistor are all N-type thin film transistors.
For the pixel structure, the invention provides a driving method of the pixel structure, which specifically comprises the following steps:
a reset phase: the first scanning line, the second scanning line and the first light-emitting control line are switched on at a high level, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, the seventh switch transistor, the eighth switch transistor, the ninth switch transistor and the tenth switch transistor are all switched on, the first reference voltage source sets the potential of the first end of the first storage capacitor and the potential of the first end of the second storage capacitor as a first reference voltage source voltage VDD, and the data line sets the potential of the second end of the first storage capacitor and the potential of the second end of the second storage capacitor as a first voltage V1;
and (3) a discharging stage: the first scanning line and the second scanning line are switched on at a high level, the first light emitting control line is switched on at a low level, the third switching transistor, the fourth switching transistor, the fifth switching transistor, the sixth switching transistor, the ninth switching transistor and the tenth switching transistor are all switched on, and the first storage capacitor and the second storage capacitor are both discharged, wherein the potential of the first end of the first storage capacitor and the potential of the first end of the second storage capacitor are respectively discharged to the threshold voltage Vth1 of the first driving transistor and the threshold voltage Vth2 of the second driving transistor;
and (3) a sustained discharge stage: the first scanning line and the first light-emitting control line are switched on at a low level, the second scanning line is switched on at a high level, and a second voltage V2 is supplied to the data line, so that the voltage difference between two ends of the first storage capacitor is Vth-V1, and the voltage difference between two ends of the second storage capacitor is Vth2-V2, wherein V1 is more than V2;
and (3) voltage stabilization: the first scanning line, the second scanning line and the first light-emitting control line are switched on at a low level, and the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, the fifth switching transistor, the sixth switching transistor, the seventh switching transistor, the eighth switching transistor, the ninth switching transistor and the tenth switching transistor are all switched off to stabilize the voltage difference between two ends of the first storage capacitor and the second storage capacitor;
a light emitting stage: the first scanning line and the second scanning line are connected with a low level, the first light-emitting control line is connected with a high level, the first switch transistor, the second switch transistor, the seventh switch transistor and the eighth switch transistor are connected, the second end potential V1 of the first storage capacitor is changed into the anode potential Voled1 of the first display device, the first end potential of the first storage capacitor is Vth1-V1+ Voled1, the second end potential V2 of the second storage capacitor is changed into the anode potential Voled2 of the second display device, the first end potential of the second storage capacitor is Vth2-V2+ Voled2, and the first driving transistor and the second driving transistor respectively drive the first display device and the second display device to emit light.
Preferably, the compensation unit includes: an eleventh switching transistor, a twelfth switching transistor, a thirteenth switching transistor, a fourteenth switching transistor, a fifteenth switching transistor, a sixteenth switching transistor, a seventeenth switching transistor, an eighteenth switching transistor, a nineteenth switching transistor, a third storage capacitor, and a fourth storage capacitor; wherein,
the grid electrode of the eleventh switching transistor is connected with the second light-emitting control line, the source electrode of the eleventh switching transistor is connected with the first reference voltage source, and the drain electrode of the eleventh switching transistor is connected with the source electrode of the first driving transistor and the source electrode of the second driving transistor;
a grid line of the twelfth switching transistor is connected with a third scanning line, a source electrode of the twelfth switching transistor is connected with a data line, and a drain electrode of the twelfth switching transistor is connected with a source electrode of the thirteenth switching transistor and the first end of the third storage capacitor;
the grid electrode of the thirteenth switching transistor is connected with the grid electrode of the fourteenth switching transistor and the third light-emitting control line, and the drain electrode of the thirteenth switching transistor is grounded;
a source electrode of the fourteenth switching transistor is connected with a first end of the fourth storage capacitor and a drain electrode of the fifteenth switching transistor, and a drain electrode of the fourteenth switching transistor is grounded;
the grid electrode of the fifteenth switching transistor is connected with the fourth scanning line, and the source electrode of the fifteenth switching transistor is connected with the data line;
the grid electrode of the sixteenth switching transistor is connected with the grid electrode of the seventeenth switching transistor and the third light-emitting control line, the source electrode of the sixteenth switching transistor is connected with the grid electrode of the first driving transistor and the second end of the third storage capacitor, and the drain electrode of the sixteenth switching transistor is connected with the drain electrode of the first driving transistor and the source electrode of the eighteenth switching transistor;
a source electrode of the seventeenth switching transistor is connected with a gate electrode of the second driving transistor and a second end of the fourth storage capacitor, and a drain electrode of the seventeenth switching transistor is connected with a drain electrode of the second driving transistor and a source electrode of the nineteenth switching transistor;
the grid electrode of the eighteenth switching transistor is connected with the grid electrode of the nineteenth switching transistor and the fourth light-emitting control line, the drain electrode of the eighteenth switching transistor is connected with the first end of the first display device, and the second end of the first display device is grounded;
the drain of the nineteenth switching transistor is connected to the first terminal of the second display device, and the second terminal of the second display device is grounded.
Further preferably, the eleventh switching transistor, the twelfth switching transistor, the thirteenth switching transistor, the fourteenth switching transistor, the fifteenth switching transistor, the sixteenth switching transistor, the seventeenth switching transistor, the eighteenth switching transistor, the nineteenth switching transistor, the first driving transistor, and the second driving transistor are all P-type thin film transistors.
Further preferably, the pixel structure further includes: a capacitance touch control unit and a light sensation touch control unit connected with the compensation unit,
the capacitive touch control unit is used for generating a corresponding electric signal according to the touch control signal and realizing finger touch control;
and the light-sensitive touch control unit is used for generating a corresponding electric signal according to the illumination intensity signal and realizing the touch control of the laser pen.
Still more preferably, the capacitive touch unit includes: a first capacitive transistor, a second capacitive transistor, a third capacitive transistor, a fifth storage capacitor, wherein,
the grid electrode of the first capacitive transistor is connected with the light-sensitive touch control unit, the source electrode of the first capacitive transistor is connected with the data line, and the drain electrode of the first capacitive transistor is connected with the first end of the fifth storage capacitor and the grid electrode of the second capacitive transistor;
the source electrode of the second capacitive transistor is connected with the drain electrode of the third capacitive transistor, and the drain electrode of the second capacitive transistor is connected with the second end of the fifth storage capacitor and the common electrode;
and the grid electrode of the third capacitance type transistor is connected with a third scanning line, and the source electrode of the third capacitance type transistor is connected with a reading line.
More preferably, the light-sensing touch unit includes: a first photo transistor, a second photo transistor, a third photo transistor, a photo transistor, and a sixth storage capacitor, wherein,
the grid electrode of the photosensitive transistor is connected with the source electrode of the first photosensitive transistor and the first end of the sixth storage capacitor, the source electrode of the photosensitive transistor is connected with the second end of the sixth storage capacitor and the source electrode of the third photosensitive transistor, and the drain electrode of the photosensitive transistor is connected with the source electrode of the second photosensitive transistor;
the grid electrode of the first light-sensing transistor is connected with the capacitive touch control unit, and the drain electrode of the first light-sensing transistor is grounded;
the grid electrode of the second light-sensitive transistor is connected with the fourth scanning line, and the drain electrode of the second light-sensitive transistor is connected with the data line;
the grid electrode of the third light-sensitive transistor is connected with the fourth light-emitting control line, and the drain electrode of the third light-sensitive transistor is connected with the reading line.
For the pixel structure, the invention provides a driving method of the pixel structure, which specifically comprises the following steps:
a reset phase: the third scanning line, the fourth scanning line and the fourth light-emitting control line are switched on at a high level, the second light-emitting control line and the third light-emitting control line are switched on at a low level, the eleventh switching transistor, the thirteenth switching transistor, the fourteenth switching transistor, the sixteenth switching transistor and the seventeenth switching transistor are all switched on, the third storage capacitor and the fourth storage capacitor are both discharged, the third storage capacitor is discharged until the potential of the second end of the third storage capacitor is VDD-Vth1, the fourth storage capacitor is discharged until the potential of the second end of the fourth storage capacitor is VDD-Vth2, in the discharging process, the first end of the third storage capacitor and the first end of the fourth storage capacitor are both grounded, the potential is 0V, the voltage difference between two ends of the third storage capacitor is VDD-Vth1, the voltage difference between two ends of the fourth storage capacitor is VDD-Vth, wherein VDD is a first reference voltage source voltage, Vth1 is a threshold voltage of the first driving transistor, and Vth2 is a threshold voltage of the second driving transistor;
first pixel circuit transition phase: the third scanning line is switched on at a low level, the fourth scanning line, the fourth light-emitting control line, the second light-emitting control line and the third light-emitting control line are switched on at a high level, the twelfth switching transistor is switched on, the data line charges the first end of the third storage capacitor to a third voltage V3, and the potential of the second end of the third storage capacitor is VDD-Vth 1+ V3;
the second pixel circuit transition stage: when the fourth scanning line is at a low level, the third scanning line, the second light-emitting control line, the third light-emitting control line and the fourth light-emitting control line are at a high level, the fifteenth switching transistor is turned on, the data line charges the first end of the fourth storage capacitor to a fourth voltage V4, and the potential of the second end of the fourth storage capacitor is VDD-Vth 2+ V4, wherein V4> V3;
a light emitting stage: the third scanning line, the fourth scanning line and the third light-emitting control line are connected at a high level, the second light-emitting control line and the fourth light-emitting control line are connected at a low level, the tenth switching transistor, the eighteenth switching transistor and the nineteenth switching transistor are connected, and the first driving transistor and the second driving transistor respectively drive the first display device and the second display device to emit light.
Preferably, the method further comprises, in the reset phase:
the first capacitive transistor is turned on, and the data line resets the potential of the finger touch point to a third voltage V3;
the first photosensitive transistor is conducted, and the sixth storage capacitor and the photosensitive transistor are reset in a grounding mode;
the method further comprises the following steps in the first pixel circuit transition phase:
the second capacitor transistor and the third capacitor transistor are turned on, the common electrode is connected with a coupling pulse signal, the potential of a section of the fifth storage capacitor is provided, and the source voltage of the second capacitor transistor is amplified;
all transistors in the light-sensing touch control unit are turned off and are in a stagnation state;
and in the second pixel transition phase, further comprising:
a first capacitive transistor, a second capacitive transistor and a third capacitive transistor in the capacitive touch unit are all closed and are in a stagnation state;
a second light-sensing transistor in the light-sensing touch unit is turned on, and outputs a fourth voltage V4 to a sixth storage capacitor, and the sixth storage capacitor is charged;
the lighting phase also comprises:
a first capacitive transistor, a second capacitive transistor and a third capacitive transistor in the capacitive touch unit are all continuously closed and are in a stagnation state;
the light-sensitive touch control unit collects a touch control signal through a reading line.
The technical solution adopted to solve the technical problem of the present invention is a display device, which includes the above-mentioned pixel structure.
Drawings
FIG. 1 is a diagram of a conventional pixel structure;
FIG. 2 is a schematic circuit diagram of a conventional pixel structure;
fig. 3 is a schematic diagram of a pixel structure according to embodiment 1 of the present invention;
fig. 4 is a circuit schematic diagram of a pixel structure of embodiment 2 of the present invention;
FIG. 5 is a timing diagram of a pixel structure according to embodiment 2 of the present invention;
fig. 6 is a circuit schematic diagram of a pixel structure of embodiment 3 of the present invention;
fig. 7 is a timing diagram of a pixel structure according to embodiment 3 of the invention.
Wherein the reference numerals are: DTFT, drive transistor; DTFT1, a first drive transistor; DTFT2, second drive transistor; t, a switching transistor; t1, a first switching transistor; t2, a second switching transistor; t3, a third switching transistor; t4, a fourth switching transistor; t5, a fifth switching transistor; t6, a sixth switching transistor; t7, seventh switching transistor; t8, an eighth switching transistor; t9, a ninth switching transistor; t10, tenth switching transistor; t11, an eleventh switching transistor; t12, a twelfth switching transistor; t13, a thirteenth switching transistor; t14, a fourteenth switching transistor; t15, a fifteenth switching transistor; t16, sixteenth switching transistor; t17, a seventeenth switching transistor; t18, an eighteenth switching transistor; t19, nineteenth switching transistor; m1, a first capacitive transistor; m2, a second capacitive transistor; m3, a third capacitive transistor; n1, a first photo transistor; n2, a second photo transistor; n3, a third photo transistor; n4, a photosensitive transistor; c1, a first storage capacitor; c2, a second storage capacitor; c3, a third storage capacitor; c4, a fourth storage capacitor; c5, a fifth storage capacitor; c6, a sixth storage capacitor; OLEDs, display devices; OLED1, first display device; OLED2, second display device; VDD, a first reference voltage source; data, Data line; scan1, first Scan line; scan2, second Scan line; scan3, third Scan line; scan4, fourth Scan line; em1, first emission control line; em2, second emission control line; em3, third emission control line; em4, fourth emission control line; vcom, common electrode.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
as shown in fig. 3, the present embodiment provides a pixel structure, which includes a plurality of pixel units (one pixel unit is defined in a dashed line frame), and a compensation unit corresponding to the pixel units, each of the pixel units includes two adjacent first pixel circuits and second pixel circuits, and as shown in fig. 4, the first pixel circuit includes: a first driving transistor DTFT1 and a first display device OLED 1; the second pixel circuit includes: a second driving transistor DTFT2 and a second display device OLED 2; wherein the first pixel circuit and the second pixel circuit share the compensation unit and are controlled by the same Data line Data. The compensation unit is configured to adjust a gate voltage of the first driving transistor DTFT1 in the first pixel circuit to eliminate an influence of a threshold voltage of the first driving transistor DTFT1 on a driving current of the first display device OLED1, and adjust a gate voltage of the second driving transistor DTFT2 in the second pixel circuit to eliminate an influence of a threshold voltage of the second driving transistor DTFT2 on a driving current of the second display device OLED 2.
The pixel structure of the embodiment includes a plurality of pixel units, each pixel unit includes two pixel circuits, and the two pixel circuits adjust the threshold voltage of the driving transistor in each pixel circuit through a compensation unit, that is, the two pixel circuits are controlled through a Data line Data, that is, two adjacent sub-pixels are controlled through the same Data line Data, at this time, the Data line Data in the existing pixel structure can be halved, the compensation unit is shared, and the number of the thin film transistors in the compensation unit can be reduced, so that the size of the pixel can be greatly reduced, the cost of the driving chip (IC) can be reduced, and further, higher image quality and higher resolution (PPI) can be obtained.
The present embodiment further provides a driving method of the pixel circuit structure, which specifically includes:
a threshold compensation stage: the gate voltage of the first driving transistor DTFT1 in the first pixel circuit is adjusted by a compensation unit to eliminate the influence of the threshold voltage of the first driving transistor DTFT1 on the driving current of the first display device OLED1, and the gate voltage of the second driving transistor DTFT2 in the second pixel circuit is adjusted to eliminate the influence of the threshold voltage of the second driving transistor DTFT2 on the driving current of the second display device OLED 2.
In the driving method of the pixel structure of the embodiment, the threshold voltages of the driving transistors in two adjacent pixel circuits are compensated by one compensation unit at the same time, so that the driving process of the structure is simpler and more convenient.
Example 2:
as shown in fig. 4, for the present embodiment, a pixel structure is provided, which includes a plurality of pixel units, and compensation units corresponding to the pixel units, where each of the pixel units includes a first pixel circuit and a second pixel circuit that are adjacent to each other, and the first pixel circuit includes: a first driving transistor DTFT1 and a first display device OLED 1; the second pixel circuit includes: a second driving transistor DTFT2 and a second display device OLED 2; wherein the first pixel circuit and the second pixel circuit share the compensation unit and are controlled by the same Data line Data. The compensation unit is configured to adjust a gate voltage of the first driving transistor DTFT1 in the first pixel circuit to eliminate an influence of a threshold voltage of the first driving transistor DTFT1 on a driving current of the first display device OLED1, and adjust a gate voltage of the second driving transistor DTFT2 in the second pixel circuit to eliminate an influence of a threshold voltage of the second driving transistor DTFT2 on a driving current of the second display device OLED 2. The compensation unit specifically includes a first switching transistor T1, a second switching transistor T2, a third switching transistor T3, a fourth switching transistor T4, a fifth switching transistor T5, a sixth switching transistor T6, a seventh switching transistor T7, an eighth switching transistor T8, a ninth switching transistor T9, a tenth switching transistor T10, a first storage capacitor C1, and a second storage capacitor C2; wherein a gate of the first switching transistor T1 is connected to a gate of the second switching transistor T2, a gate of the seventh switching transistor T7, and the first emission control line Em1, a source thereof is connected to a source of the second switching transistor T2 and the first reference voltage source VDD, and a drain thereof is connected to a source of the fourth switching transistor T4 and a source of the first driving transistor DTFT 1; the gate of the second switching transistor T2 is connected to the gate of an eighth switching transistor T8, and the drain is connected to the source of the fifth switching transistor T5 and the source of a second driving transistor DTFT 2; the gate of the third switching transistor T3 is connected to the gate of the fourth switching transistor T4 and the first Scan line Scan1, the source is connected to the Data line Data, and the drain is connected to the second terminal of the first storage capacitor C1 and the source of the seventh switching transistor T7; the drain electrode of the fourth switching transistor T4 is connected to the first end of the first storage capacitor C1 and the gate electrode of the first driving transistor DTFT 1; a gate of the fifth switching transistor T5 is connected to the gate of the sixth switching transistor T6 and the second Scan line Scan2, and a drain thereof is connected to the first terminal of the second storage capacitor C2 and the gate of the second driving transistor DTFT 2; the source of the sixth switching transistor T6 is connected to the Data line Data, and the drain is connected to the second terminal of the second storage capacitor C2 and the drain of the eighth switching transistor T8; a drain electrode of the seventh switching transistor T7 is connected to the source electrode of the ninth switching transistor T9, the drain electrode of the first driving transistor DTFT1, a first terminal of the first display device, and a second terminal of the first display device is grounded; a drain electrode of the eighth switching transistor T8 is connected to the source electrode of the tenth switching transistor T10, the drain electrode of the second driving transistor DTFT2, a first terminal of the second display device, and a second terminal of the second display device is grounded; the gate of the ninth switching transistor T9 is connected to the gate of the tenth switching transistor T10 and the second Scan line Scan2, and the drain is grounded; the drain of the tenth switching transistor T10 is grounded.
In order to better prepare such a pixel structure and to better control each pixel unit, the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4, the fifth switching transistor T5, the sixth switching transistor T6, the seventh switching transistor T7, the eighth switching transistor T8, the ninth switching transistor T9, the tenth switching transistor T10, the first driving transistor DTFT1, and the second driving transistor DTFT2 are all N-type thin film transistors.
As shown in fig. 4 and fig. 5, the present embodiment further provides a driving method of the pixel structure, which specifically includes the following steps:
reset phase (1 st period): the first Scan line Scan1, the second Scan line Scan2, the first emission control line Em1 are turned on at a high level, the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4, the fifth switching transistor T5, the sixth switching transistor T6, the seventh switching transistor T7, the eighth switching transistor T8, the ninth switching transistor T9, and the tenth switching transistor T10 are all turned on, the first reference voltage source sets the potential of the first terminal of the first storage capacitor C1 and the potential of the first terminal of the second storage capacitor C2 to the first reference voltage source voltage VDD, the first voltage V1 is applied to the Data line Data, and at this time, since the second switching transistor T3, the fourth switching transistor T4, the fifth switching transistor T5, the sixth switching transistor T6, and all turned on, the potential of the second terminal of the first storage capacitor C1 and the potential of the second storage capacitor C2 are both turned on at the first reference voltage VDD 1, i.e., a1 ═ Vdd, b1 ═ V1; a2 Vdd, b 2V 1.
Discharge phase (period 2): the first Scan line Scan1 and the second Scan line Scan2 are turned on at a high level, the first light emission control line Em1 is turned on at a low level, the third switching transistor T3, the fourth switching transistor T4, the fifth switching transistor T5, the sixth switching transistor T6, the ninth switching transistor T9, and the tenth switching transistor T10 are all turned on, and the first storage capacitor C1 and the second storage capacitor C2 are all discharged, wherein the potential of the first end of the first storage capacitor C1 and the potential of the first end of the second storage capacitor C2 are respectively discharged to the threshold voltage Vth1 of the first driving transistor DTFT1 and the threshold voltage Vth2 of the second driving transistor DTFT 2; in addition, since the ninth switching transistor T9 and the tenth switching transistor T10 are turned on, current in the circuit does not pass through the first display device OLED1 and the second display device OLED2, which indirectly reduces power consumption of the first display device OLED1 and the second display device OLED 2.
Discharge sustaining period (period 3): the first Scan line Scan1 and the first light emitting control line Em1 are turned on low, the second Scan line Scan2 is turned on high, and the second voltage V2 is applied to the Data line Data, at this time, the potential at the point of the second end b2 of the second storage capacitor C2 is also changed into V2, and the point of the first end a2 of the second storage capacitor C2 is maintained at Vth2, so that the voltage difference between the two ends of the first storage capacitor C1 is Vth-V1, and the voltage difference between the two ends of the second storage capacitor C2 is Vth2-V2, where V1> V2.
Voltage stabilization phase (period 4): the first Scan line Scan1, the second Scan line Scan2 and the first light emitting control line Em1 are turned on and off, and the first switch transistor T1, the second switch transistor T2, the third switch transistor T3, the fourth switch transistor T4, the fifth switch transistor T5, the sixth switch transistor T6, the seventh switch transistor T7, the eighth switch transistor T8, the ninth switch transistor T9 and the tenth switch transistor T10 are all turned off, so that the voltage difference between the two ends of the first storage capacitor C1 and the two ends of the second storage capacitor C2 are stabilized, and preparation is made for the light emitting stage.
Luminescence phase (period 5): the first Scan line Scan1, the second Scan line Scan2 are turned on at a low level, the first emission control line Em1 is turned on at a high level, the first switching transistor T1, the second switching transistor T2, the seventh switching transistor T7, and the eighth switching transistor T8 are turned on, the second terminal potential V1 of the first storage capacitor C1 is changed to the anode potential Voled1 of the first display device OLED1, the first terminal potential of the first storage capacitor C1 is Vth1-V1+ Voled1, the second terminal potential V2 of the second storage capacitor C2 is changed to the anode potential Voled2 of the second display device OLED2, the first terminal potential of the second storage capacitor C2 is Vth2-V2+ Voled2, the first driving transistor DTFT1 and the second driving transistor DTFT2 drive the first display device OLED1 and the second display device OLED2 to emit light, respectively.
The current flowing through the first display device OLED1 can be derived according to the thin film transistor saturation current formula:
Ioled1＝K(VGS-Vth1)2
＝K[(Vth1-V1+Voled1)-Voled1–Vth1]2
＝K·(V1)2
similarly, the current flowing through the second display device OLED2 is Ioled2 ═ K · (V2)2
According to the obtained current values of the first display device OLED1 and the second display device OLED2, the pixel structure is restrained from being displayed with high resolution, and meanwhile, the influence of the threshold voltage of the driving transistor on the pixel structure can be avoided, so that the pixel structure of the embodiment is displayed more uniformly.
Example 3:
as shown in fig. 6, the present embodiment provides a pixel structure having both a capacitive touch unit and a photo touch unit, which specifically includes a plurality of pixel units, and a compensation unit, a capacitive touch unit and a photo touch unit corresponding to the pixel units, wherein each pixel unit includes a first pixel circuit and a second pixel circuit that are adjacent to each other, and the first pixel circuit includes: a first driving transistor DTFT1 and a first display device OLED 1; the second pixel circuit includes: a second driving transistor DTFT2 and a second display device OLED 2; wherein the first pixel circuit and the second pixel circuit share the compensation unit and are controlled by the same Data line Data. The compensation unit is configured to adjust a gate voltage of the first driving transistor DTFT1 in the first pixel circuit to eliminate an influence of a threshold voltage of the first driving transistor DTFT1 on a driving current of the first display device OLED1, and adjust a gate voltage of the second driving transistor DTFT2 in the second pixel circuit to eliminate an influence of a threshold voltage of the second driving transistor DTFT2 on a driving current of the second display device OLED 2. The capacitive touch control unit is used for generating a corresponding electric signal according to the touch control signal and realizing finger touch control; and the light-sensitive touch control unit is used for generating a corresponding electric signal according to the illumination intensity signal and realizing the touch control of the laser pen.
Wherein, the compensation unit of this embodiment includes: an eleventh switching transistor T11, a twelfth switching transistor T12, a thirteenth switching transistor T13, a fourteenth switching transistor T14, a fifteenth switching transistor T15, a sixteenth switching transistor T16, a seventeenth switching transistor T17, an eighteenth switching transistor T18, a nineteenth switching transistor T19, a third storage capacitor C3, and a fourth storage capacitor C4; wherein a gate of the eleventh switching transistor T11 is connected to a second emission control line Em2, a source thereof is connected to a first reference voltage source VDD, and a drain thereof is connected to a source of the first driving transistor DTFT1 and a source of the second driving transistor DTFT 2; a gate line of the twelfth switching transistor T12 is connected to a third Scan line Scan3, a source thereof is connected to the Data line Data, and a drain thereof is connected to a source of the thirteenth switching transistor T13 and the first end of the third storage capacitor C3; a gate of the thirteenth switching transistor T13 is connected to the gate of the fourteenth switching transistor T14 and the third emission control line Em3, and a drain thereof is grounded; the source of the fourteenth switching transistor T14 is connected to the first end of the fourth storage capacitor C4 and the drain of the fifteenth switching transistor T15, and the drain is grounded; the gate of the fifteenth switching transistor T15 is connected to the fourth Scan line Scan4, and the source is connected to the Data line Data; a gate of the sixteenth switching transistor T16 is connected to a gate of a seventeenth switching transistor T17 and a third emission control line Em3, a source thereof is connected to a gate of the first driving transistor DTFT1 and a second end of the third storage capacitor C3, and a drain thereof is connected to a drain of the first driving transistor DTFT1 and a source of the eighteenth switching transistor T18; a source of the seventeenth switching transistor T17 is connected to the gate of the second driving transistor DTFT2 and the second terminal of the fourth storage capacitor C4, and a drain is connected to the drain of the second driving transistor DTFT2 and the source of the nineteenth switching transistor T19; a gate of the eighteenth switching transistor T18 is connected to the gate of the nineteenth switching transistor T19 and the fourth emission control line Em4, a drain thereof is connected to the first terminal of the first display device OLED1, and the second terminal of the first display device OLED1 is grounded; a drain of the nineteenth switching transistor T19 is connected to the first terminal of the second display device OLED2, and the second terminal of the second display device OLED2 is grounded.
Preferably, the eleventh switching transistor T11, the twelfth switching transistor T12, the thirteenth switching transistor T13, the fourteenth switching transistor T14, the fifteenth switching transistor T15, the sixteenth switching transistor T16, the seventeenth switching transistor T17, the eighteenth switching transistor T18, the nineteenth switching transistor T19, the first driving transistor DTFT1, and the second driving transistor DTFT2 are all P-type thin film transistors.
The capacitive touch unit includes: a first capacitive transistor M1, a second capacitive transistor M2, a third capacitive transistor M3, and a fifth storage capacitor C5, wherein a gate of the first capacitive transistor M1 is connected to the light-sensing touch unit, a source thereof is connected to the Data line Data, and a drain thereof is connected to a first end of the fifth storage capacitor C5 and a gate of the second capacitive transistor M2; the source of the second capacitive transistor M2 is connected to the drain of the third capacitive transistor M3, and the drain is connected to the second terminal of the fifth storage capacitor C5 and the common electrode Vcom; the gate of the third capacitive transistor M3 is connected to the third Scan line Scan3, and the source is connected to the read line Readline. The light-sensing touch unit includes: a first photo transistor N1, a second photo transistor N2, a third photo transistor N3, a photo transistor N4, and a sixth storage capacitor C6, wherein a gate of the photo transistor N4 is connected to a source of the first photo transistor N1 and a first end of the sixth storage capacitor C6, a source of the photo transistor N6 is connected to a second end of the sixth storage capacitor C6 and a source of the third photo transistor N3, and a drain of the photo transistor N2 is connected to a source of the second photo transistor N2; the grid electrode of the first light-sensing transistor N1 is connected with the capacitive touch control unit, and the drain electrode is grounded; the grid electrode of the second photosensitive transistor N2 is connected with a fourth scanning line Scan4, and the drain electrode is connected with a Data line Data; the gate of the third photo transistor N3 is connected to the fourth emission control line Em4, and the drain is connected to the readout line.
As shown in fig. 6 and 7, the present embodiment further provides a driving method of the pixel structure, which specifically includes the following steps:
reset phase (1 st period): the third Scan line Scan3, the fourth Scan line Scan4, and the fourth emission control line Em4 are turned on at a high level, and the second emission control line Em2 and the third emission control line Em3 are turned on at a low level;
the compensation unit part: the eleventh switch transistor T11, the thirteenth switch transistor T13, the fourteenth switch transistor T14, the sixteenth switch transistor T16 and the seventeenth switch transistor T17 are all turned on, at this time, the third storage capacitor C3 and the fourth storage capacitor C4 are both discharged, the third storage capacitor C3 is discharged until the potential of the second terminal thereof is VDD-Vth1, and the fourth storage capacitor C4 is discharged until the potential of the second terminal thereof is VDD-Vth2, and in the discharging process, the current still cannot pass through the OLED. The ground potential of the first end of the third storage capacitor C3 and the ground potential of the first end of the fourth storage capacitor C4 are both 0V, the voltage difference between the two ends of the third storage capacitor C3 is VDD-Vth1, and the voltage difference between the two ends of the fourth storage capacitor C4 is VDD-Vth2, wherein VDD is the voltage of the first reference voltage source VDD, Vth1 is the threshold voltage of the first driving transistor DTFT1, and Vth2 is the threshold voltage of the second driving transistor DTFT 2;
capacitive touch cell part: the first capacitive transistor M1 is turned on, the voltage Vdata input by the Data line Data provides a reset signal, at this time, Vdata is V3, the touch cell is reset in the process, the potential at the point d is V3, and the second capacitive transistor M2 and the third capacitive transistor M3 are turned off when the high potential is connected. This process provides for finger touch.
Light-sensitive touch unit part: the first photo transistor N1 is turned on, and the sixth storage capacitor C6 and the photo transistor N4 are reset to ground, and the potential is 0V, so as to prepare for the next stage of photo touch operation, and at this time, the second photo transistor N2, the third photo transistor N3 and the photo transistor N4 are turned off.
First pixel circuit transition phase (period 2): the third Scan line Scan3 is turned on at a low level, and the fourth Scan line Scan4, the fourth emission control line Em4, the second emission control line Em2, and the third emission control line Em3 are turned on at a high level;
the compensation unit part: the twelfth switching transistor T12 in the compensation unit is turned on, the other switching transistors are turned off, the Data line Data charges the first end potential of the third storage capacitor C3 from 0V to the third voltage V3, and the second end b3 of the third storage capacitor C3 is floating, so that the potential of the second end of the third storage capacitor C3 (the gate of the first driving transistor DTFT 1) at the point b3 undergoes an equal-voltage jump to maintain the original voltage difference (Vdd-Vth1) between the points a3 and b3, and at this time, the potential of the second end of the third storage capacitor C3 jumps to Vdd-Vth 1+ V3;
capacitive touch cell part: the first capacitive transistor M1 is turned off, the second capacitive transistor M2 and the third capacitive transistor M3 are turned on; at this stage, the coupling pulse signal (common electrode Vcom) provides a potential at one end of the fifth storage capacitor C5 to form a coupling capacitor, and another important role is to amplify the potential at the source of the second capacitive transistor M2, the touch of the finger directly causes the potential at the gate of the second capacitive transistor M2 to decrease, when the gate-source voltage of the second capacitive transistor M2 meets the transistor-on condition, a signal will pass through the second capacitive transistor M2, which is referred to as a capacitive touch cell buffering stage, i.e., "waiting" for the decrease of the gate potential of the second capacitive transistor M2, and the main cause of the decrease is the touch of the finger. When the finger is inserted to directly cause the potential at the node N1 to decrease, and the condition that the second capacitive transistor M2 is turned on is reached, and the I & V characteristic curve is in the amplification region, the second capacitive transistor M2 as an amplification transistor turns on and amplifies the signal of the coupled pulse. Amplifying the signal also helps to collect the terminal signal. The transverse (X direction) scanning signal of the fourth scanning signal inputted from the fourth scanning line Scan4 has an acquisition function. And simultaneously, a Y-direction signal is collected by a Y-reading Line Read Line. This determines the X, Y coordinates of the finger touch location. In the process, as long as the finger participates in touch control, the coordinate position can be acquired at any time. At this time, the Read Line is used for touch signal acquisition for the first time.
Light-sensitive touch unit part: the first photo transistor N1, the second photo transistor N2, the third photo transistor N3, and the photo transistor N4 in the phase photo cell are all turned off and in a dead state.
Second pixel transition phase (period 3): the fourth Scan line Scan4 is turned on low, and the third Scan line Scan3, the second emission control line Em2, the third emission control line Em3, and the fourth emission control line Em4 are turned on high.
The compensation unit part: the fifteenth switching transistor T15 is turned on, the Data line Data charges the first end a4 of the fourth storage capacitor C4 from 0V to the fourth voltage V4, and the second end b4 of the fourth storage capacitor C4 is floating, so that the potential of the second end b4 of the fourth storage capacitor C4 (the gate of the second driving transistor DTFT 2) is subjected to an isobaric jump to maintain the original voltage difference (Vdd-Vth2) between the points a4 and b4, and the potential of the second end b4 of the fourth storage capacitor C4 is Vdd-Vth 2+ V4;
capacitive touch cell part: at this stage, the first capacitive transistor N1, the second capacitive transistor N2, and the third capacitive transistor N3 in the capacitive touch cell are all turned off and in a dead state.
In the light-sensing touch unit part, the gate and the source of the light-sensing transistor N4 are connected, the first light-sensing transistor N1 is turned off, the second light-sensing transistor N2 is turned on, the coupling voltage V4 is output, the voltage at the moment is V4, N4 is subjected to self-potential conversion, the potential difference stored in the sixth storage capacitor C6 is a constant value at the moment, when light irradiates the unit, the intensity of the light received by the light-sensing transistor is increased, the charging current is increased, the voltage is temporarily stored at two ends of the sixth storage capacitor C6, and the reading process at the next stage is waited.
Luminescence phase (period 4): the third Scan line Scan3, the fourth Scan line Scan4, and the third emission control line Em3 are turned on at a high level, and the second emission control line Em2 and the fourth emission control line Em4 are turned on at a low level.
The compensation unit part: the tenth, eighteenth and nineteenth switching transistors T10, T18 and T19 are turned on, and the first and second driving transistors DTFT1 and DTFT2 drive the first and second display devices OLED1 and OLED2 to emit light, respectively.
The current flowing through the first display device OLED1 can be derived according to the thin film transistor saturation current formula:
Ioled1＝K(VGS-Vth1)2
＝K[(Vth1-V3+Voled1)-Voled1–Vth1]2
＝K·(V3)2
similarly, the current flowing through the second display device OLED2 is Ioled2 ═ K · (V4)2
Capacitive touch cell part: at this stage, the first capacitive transistor N1, the second capacitive transistor N2, and the third capacitive transistor N3 in the capacitive touch cell are all turned off and in a dead state.
Light-sensitive touch unit part: at the moment, the amplified storage signal is transmitted to an amplifier received by the tail end, and the amplified signal is transmitted to a processor for data calculation and analysis; in this period, a touch operation occurs, and the difference between the intensity changes of the photoelectric signals before and after the touch operation is compared with the non-touch threshold, so as to determine whether there is a touch (change in light irradiation intensity), and thus the X-direction coordinate is determined by the output point of the fourth emission control Line Em4, and the Y-direction coordinate is determined by the Y-Read Line. At this time, the Read Line is used for touch signal acquisition for the second time.
As can be seen from the above equation, the operating currents flowing through the two display devices at this time are not affected by the threshold voltages of the respective driving transistors, and are related to only the voltage Vdata input to the Data line Data at this time. The problem of threshold voltage (Vth) drift of the driving transistor caused by the process and long-time operation is thoroughly solved, the influence of the driving transistor on the driving current of the display device is eliminated, and the normal work of the display device is ensured. Meanwhile, the driving of 2 Pixel circuits is ensured to be completed by using 1 compensation unit, and the number of compensated transistor devices is reduced by the method, so that the size of the Pixel Pitch can be greatly reduced, the IC cost is reduced, and higher image quality and higher PPI are obtained.
Example 4:
the present embodiment provides a display device including the pixel structure described in any one of embodiments 1 to 3. The display device may be: the display device comprises any product or component with a display function, such as a liquid crystal display panel, electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
Since the display device of the present embodiment includes the pixel structure, it has high resolution.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A pixel structure comprising a plurality of pixel cells, the pixel structure further comprising: a compensation unit, each of the pixel units including a first pixel circuit and a second pixel circuit that are adjacent to each other, the first pixel circuit including: a first driving transistor and a first display device; the second pixel circuit includes: a second driving transistor and a second display device; wherein the first pixel circuit and the second pixel circuit share the compensation unit and are controlled by the same data line;
the compensation unit is used for adjusting the gate voltage of a first driving transistor in the first pixel circuit to eliminate the influence of the threshold voltage of the first driving transistor on the driving current of the first display device, and adjusting the gate voltage of a second driving transistor in the second pixel circuit to eliminate the influence of the threshold voltage of the second driving transistor on the driving current of the second display device, the pixel structure is controlled by two scanning lines, the compensation unit comprises two storage capacitors, and the two scanning lines respectively control the two storage capacitors to store the threshold voltage of the first driving transistor and the threshold voltage of the second driving transistor;
the two scanning lines include a first scanning line and a second scanning line, and the compensation unit further includes: the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, the seventh switch transistor, the eighth switch transistor, the ninth switch transistor and the tenth switch transistor, wherein the two storage capacitors comprise a first storage capacitor and a second storage capacitor; wherein,
the grid electrode of the first switch transistor is connected with the grid electrode of the second switch transistor, the grid electrode of the seventh switch transistor and the first light-emitting control line, the source electrode of the first switch transistor is connected with the source electrode of the second switch transistor and a first reference voltage source, and the drain electrode of the first switch transistor is connected with the source electrode of the fourth switch transistor and the source electrode of the first drive transistor;
the grid electrode of the second switching transistor is connected with the grid electrode of the eighth switching transistor, and the drain electrode of the second switching transistor is connected with the source electrode of the fifth switching transistor and the source electrode of the second driving transistor;
the grid electrode of the third switching transistor is connected with the grid electrode of the fourth switching transistor and the first scanning line, the source electrode of the third switching transistor is connected with the data line, and the drain electrode of the third switching transistor is connected with the second end of the first storage capacitor and the source electrode of the seventh switching transistor;
the drain electrode of the fourth switching transistor is connected with the first end of the first storage capacitor and the grid electrode of the first driving transistor;
the grid electrode of the fifth switching transistor is connected with the grid electrode of the sixth switching transistor and the second scanning line, and the source drain electrode is connected with the first end of the second storage capacitor and the grid electrode of the second driving transistor;
the source electrode of the sixth switching transistor is connected with the data line, and the drain electrode of the sixth switching transistor is connected with the second end of the second storage capacitor and the drain electrode of the eighth switching transistor;
a drain electrode of the seventh switching transistor is connected with a source electrode of the ninth switching transistor, a drain electrode of the first driving transistor DTFT1, and a first end of the first display device, and a second end of the first display device is grounded;
a drain electrode of the eighth switching transistor is connected to a source electrode of the tenth switching transistor, a drain electrode of the second driving transistor DTFT2, and a first terminal of the second display device, and a second terminal of the second display device is grounded;
the grid electrode of the ninth switching transistor is connected with the grid electrode of the tenth switching transistor and the second scanning line, and the drain electrode of the ninth switching transistor is grounded;
a drain of the tenth switching transistor is grounded;
or, the two scanning lines include a third scanning line and a fourth scanning line, and the compensation unit further includes: an eleventh switching transistor, a twelfth switching transistor, a thirteenth switching transistor, a fourteenth switching transistor, a fifteenth switching transistor, a sixteenth switching transistor, a seventeenth switching transistor, an eighteenth switching transistor, and a nineteenth switching transistor, wherein the two storage capacitors include a third storage capacitor and a fourth storage capacitor; wherein,
the grid electrode of the eleventh switching transistor is connected with the second light-emitting control line, the source electrode of the eleventh switching transistor is connected with the first reference voltage source, and the drain electrode of the eleventh switching transistor is connected with the source electrode of the first driving transistor and the source electrode of the second driving transistor;
a grid line of the twelfth switching transistor is connected with a third scanning line, a source electrode of the twelfth switching transistor is connected with a data line, and a drain electrode of the twelfth switching transistor is connected with a source electrode of the thirteenth switching transistor and the first end of the third storage capacitor;
the grid electrode of the thirteenth switching transistor is connected with the grid electrode of the fourteenth switching transistor and the third light-emitting control line, and the drain electrode of the thirteenth switching transistor is grounded;
a source electrode of the fourteenth switching transistor is connected with a first end of the fourth storage capacitor and a drain electrode of the fifteenth switching transistor, and a drain electrode of the fourteenth switching transistor is grounded;
the grid electrode of the fifteenth switching transistor is connected with the fourth scanning line, and the source electrode of the fifteenth switching transistor is connected with the data line;
the grid electrode of the sixteenth switching transistor is connected with the grid electrode of the seventeenth switching transistor and the third light-emitting control line, the source electrode of the sixteenth switching transistor is connected with the grid electrode of the first driving transistor and the second end of the third storage capacitor, and the drain electrode of the sixteenth switching transistor is connected with the drain electrode of the first driving transistor and the source electrode of the eighteenth switching transistor;
a source electrode of the seventeenth switching transistor is connected with a gate electrode of the second driving transistor and a second end of the fourth storage capacitor, and a drain electrode of the seventeenth switching transistor is connected with a drain electrode of the second driving transistor and a source electrode of the nineteenth switching transistor;
the grid electrode of the eighteenth switching transistor is connected with the grid electrode of the nineteenth switching transistor and the fourth light-emitting control line, the drain electrode of the eighteenth switching transistor is connected with the first end of the first display device, and the second end of the first display device is grounded;
the drain of the nineteenth switching transistor is connected to the first terminal of the second display device, and the second terminal of the second display device is grounded.
2. The pixel structure of claim 1, wherein when the compensation unit further comprises: the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, the seventh switch transistor, the eighth switch transistor, the ninth switch transistor, and the tenth switch transistor, when the storage capacitors include the first storage capacitor and the second storage capacitor, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, the seventh switch transistor, the eighth switch transistor, the ninth switch transistor, the tenth switch transistor, the first driving transistor, and the second driving transistor are all N-type thin film transistors.
3. The pixel structure according to claim 1, wherein the compensation unit further comprises: the first driving transistor and the second driving transistor are all P-type thin film transistors when the two storage capacitors comprise a third storage capacitor and a fourth storage capacitor.
4. The pixel structure according to claim 1 or 3, further comprising: a capacitance touch control unit and a light sensation touch control unit connected with the compensation unit,
the capacitive touch control unit is used for generating a corresponding electric signal according to the touch control signal and realizing finger touch control;
and the light-sensitive touch control unit is used for generating a corresponding electric signal according to the illumination intensity signal and realizing the touch control of the laser pen.
5. The pixel structure of claim 4, wherein the capacitive touch cell comprises: a first capacitive transistor, a second capacitive transistor, a third capacitive transistor, a fifth storage capacitor, wherein,
the grid electrode of the first capacitive transistor is connected with the light-sensitive touch control unit, the source electrode of the first capacitive transistor is connected with the data line, and the drain electrode of the first capacitive transistor is connected with the first end of the fifth storage capacitor and the grid electrode of the second capacitive transistor;
the source electrode of the second capacitive transistor is connected with the drain electrode of the third capacitive transistor, and the drain electrode of the second capacitive transistor is connected with the second end of the fifth storage capacitor and the common electrode;
and the grid electrode of the third capacitance type transistor is connected with a third scanning line, and the source electrode of the third capacitance type transistor is connected with a reading line.
6. The pixel structure of claim 4, wherein the light-sensitive touch unit comprises: a first photo transistor, a second photo transistor, a third photo transistor, a photo transistor, and a sixth storage capacitor, wherein,
the grid electrode of the photosensitive transistor is connected with the source electrode of the first photosensitive transistor and the first end of the sixth storage capacitor, the source electrode of the photosensitive transistor is connected with the second end of the sixth storage capacitor and the source electrode of the third photosensitive transistor, and the drain electrode of the photosensitive transistor is connected with the source electrode of the second photosensitive transistor;
the grid electrode of the first light-sensing transistor is connected with the capacitive touch control unit, and the drain electrode of the first light-sensing transistor is grounded;
the grid electrode of the second light-sensitive transistor is connected with the fourth scanning line, and the drain electrode of the second light-sensitive transistor is connected with the data line;
the grid electrode of the third light-sensitive transistor is connected with the fourth light-emitting control line, and the drain electrode of the third light-sensitive transistor is connected with the reading line.
7. A method of driving a pixel structure, the pixel structure being as claimed in any one of claims 1 to 6, the method comprising:
a threshold compensation stage: adjusting, by a compensation unit, a gate voltage of a first driving transistor in the first pixel circuit to eliminate an influence of a threshold voltage of the first driving transistor on the first display device driving current, and adjusting a gate voltage of a second driving transistor in the second pixel circuit to eliminate an influence of the threshold voltage of the second driving transistor on the second display device driving current;
when the compensation unit further comprises: when the two storage capacitors include a first storage capacitor and a second storage capacitor, the driving method specifically includes:
a reset phase: the first scanning line, the second scanning line and the first light-emitting control line are switched on at a high level, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, the seventh switch transistor, the eighth switch transistor, the ninth switch transistor and the tenth switch transistor are all switched on, the first reference voltage source sets the potential of the first end of the first storage capacitor and the potential of the first end of the second storage capacitor as a first reference voltage source voltage VDD, and the potential of the second end of the first storage capacitor and the potential of the second end of the second storage capacitor of the data line are set as a first voltage V1;
and (3) a discharging stage: the first scanning line and the second scanning line are switched on at a high level, the first light emitting control line is switched on at a low level, the third switching transistor, the fourth switching transistor, the fifth switching transistor, the sixth switching transistor, the ninth switching transistor and the tenth switching transistor are all switched on, and the first storage capacitor and the second storage capacitor are both discharged, wherein the potential of the first end of the first storage capacitor and the potential of the first end of the second storage capacitor are respectively discharged to the threshold voltage Vth1 of the first driving transistor and the threshold voltage Vth2 of the second driving transistor;
and (3) a sustained discharge stage: the first scanning line and the first light-emitting control line are switched on at a low level, the second scanning line is switched on at a high level, and a second voltage V2 is supplied to the data line, so that the voltage difference between two ends of the first storage capacitor is Vth-V1, and the voltage difference between two ends of the second storage capacitor is Vth2-V2, wherein V1 is more than V2;
and (3) voltage stabilization: the first scanning line, the second scanning line and the first light-emitting control line are switched on at a low level, and the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, the fifth switching transistor, the sixth switching transistor, the seventh switching transistor, the eighth switching transistor, the ninth switching transistor and the tenth switching transistor are all switched off to stabilize the voltage difference between two ends of the first storage capacitor and the second storage capacitor;
a light emitting stage: the first scanning line and the second scanning line are connected with a low level, the first light-emitting control line is connected with a high level, the first switch transistor, the second switch transistor, the seventh switch transistor and the eighth switch transistor are connected, the second end potential V1 of the first storage capacitor is changed into an anode potential Voled1 of the first display device, the first end potential of the first storage capacitor is Vth1-V1+ Voled1, the second end potential V2 of the second storage capacitor is changed into an anode potential Voled2 of the second display device, the first end potential of the second storage capacitor is Vth2-V2+ Voled2, and the first driving transistor and the second driving transistor respectively drive the first display device and the second display device to emit light;
when the compensation unit further comprises: when the two storage capacitors comprise a third storage capacitor and a fourth storage capacitor, the driving method specifically comprises the following steps:
a reset phase: the third scanning line, the fourth scanning line and the fourth light-emitting control line are switched on at a high level, the second light-emitting control line and the third light-emitting control line are switched on at a low level, the eleventh switching transistor, the thirteenth switching transistor, the fourteenth switching transistor, the sixteenth switching transistor and the seventeenth switching transistor are all switched on, the third storage capacitor and the fourth storage capacitor are both discharged, the third storage capacitor is discharged until the potential of the second end of the third storage capacitor is VDD-Vth1, the fourth storage capacitor is discharged until the potential of the second end of the fourth storage capacitor is VDD-Vth2, in the discharging process, the first end of the third storage capacitor and the first end of the fourth storage capacitor are both grounded, the potential is 0V, the voltage difference between two ends of the third storage capacitor is VDD-Vth1, the voltage difference between two ends of the fourth storage capacitor is VDD-Vth, wherein VDD is a first reference voltage source voltage, Vth1 is a threshold voltage of the first driving transistor, and Vth2 is a threshold voltage of the second driving transistor;
first pixel circuit transition phase: the third scanning line is switched on at a low level, the fourth scanning line, the fourth light-emitting control line, the second light-emitting control line and the third light-emitting control line are switched on at a high level, the twelfth switching transistor is switched on, the data line charges the first end of the third storage capacitor to a third voltage V3, and the potential of the second end of the third storage capacitor is VDD-Vth 1+ V3;
the second pixel circuit transition stage: when the fourth scanning line is at a low level, the third scanning line, the second light-emitting control line, the third light-emitting control line and the fourth light-emitting control line are at a high level, the fifteenth switching transistor is turned on, the data line charges the first end of the fourth storage capacitor to a fourth voltage V4, and the potential of the second end of the fourth storage capacitor is VDD-Vth 2+ V4, wherein V4> V3;
a light emitting stage: the third scanning line, the fourth scanning line and the third light-emitting control line are connected at a high level, the second light-emitting control line and the fourth light-emitting control line are connected at a low level, the tenth switching transistor, the eighteenth switching transistor and the nineteenth switching transistor are connected, and the first driving transistor and the second driving transistor respectively drive the first display device and the second display device to emit light.
8. The driving method of a pixel structure according to claim 7, wherein the compensation unit further comprises: when the two storage capacitors comprise a third storage capacitor and a fourth storage capacitor, the reset stage further comprises:
the first capacitive transistor is turned on, and the data line resets the potential of the finger touch point to a third voltage V3;
the first photosensitive transistor is conducted, and the sixth storage capacitor and the photosensitive transistor are reset in a grounding mode;
the method further comprises the following steps in the first pixel circuit transition phase:
the second capacitive transistor and the third capacitive transistor are turned on, the common electrode is connected with the coupling pulse signal, the potential of one end of the fifth storage capacitor is provided, and the source voltage of the second capacitive transistor is amplified;
all transistors in the light-sensing touch control unit are turned off and are in a stagnation state;
and in the second pixel transition phase, further comprising:
a first capacitive transistor, a second capacitive transistor and a third capacitive transistor in the capacitive touch unit are all closed and are in a stagnation state;
a second light-sensing transistor in the light-sensing touch unit is turned on, and outputs a fourth voltage V4 to a sixth storage capacitor, and the sixth storage capacitor is charged;
the lighting phase also comprises:
a first capacitive transistor, a second capacitive transistor and a third capacitive transistor in the capacitive touch unit are continuously closed and are in a stagnation state;
the light-sensitive touch control unit collects a touch control signal through a reading line.
9. A display device comprising a pixel structure according to any one of claims 1 to 6.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410321351.2A CN104134426B (en) | 2014-07-07 | 2014-07-07 | Pixel structure and driving method thereof, and display device |
| PCT/CN2014/088396 WO2016004690A1 (en) | 2014-07-07 | 2014-10-11 | Pixel structure, driving method therefor, and display device |
| EP14882770.2A EP3168832A4 (en) | 2014-07-07 | 2014-10-11 | Pixel structure, driving method therefor, and display device |
| US14/778,848 US9972248B2 (en) | 2014-07-07 | 2014-10-11 | Pixel structure and driving method thereof, and display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410321351.2A CN104134426B (en) | 2014-07-07 | 2014-07-07 | Pixel structure and driving method thereof, and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104134426A CN104134426A (en) | 2014-11-05 |
| CN104134426B true CN104134426B (en) | 2017-02-15 |
Family
ID=51807078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410321351.2A Active CN104134426B (en) | 2014-07-07 | 2014-07-07 | Pixel structure and driving method thereof, and display device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9972248B2 (en) |
| EP (1) | EP3168832A4 (en) |
| CN (1) | CN104134426B (en) |
| WO (1) | WO2016004690A1 (en) |
Families Citing this family (42)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531106B (en) * | 2013-10-28 | 2015-06-03 | 京东方科技集团股份有限公司 | Active matrix and organic light emission diode displaying back plate and active and organic light emitting diode displaying equipment |
| CN104064143B (en) * | 2014-06-13 | 2017-02-08 | 上海天马有机发光显示技术有限公司 | Organic light-emitting diode pixel driving circuit and display device |
| CN104252845B (en) | 2014-09-25 | 2017-02-15 | 京东方科技集团股份有限公司 | Pixel driving circuit, pixel driving method, display panel and display device |
| CN104318898B (en) * | 2014-11-11 | 2017-12-08 | 京东方科技集团股份有限公司 | Image element circuit, driving method and display device |
| CN104361862A (en) * | 2014-11-28 | 2015-02-18 | 京东方科技集团股份有限公司 | Array substrate, drive method thereof, display panel and display device |
| CN104464644A (en) | 2015-01-05 | 2015-03-25 | 京东方科技集团股份有限公司 | Pixel structure, display panel and display device |
| US9600705B2 (en) * | 2015-02-11 | 2017-03-21 | Fingerprint Cards Ab | Capacitive fingerprint sensing device with current readout from sensing elements |
| CN105679249B (en) * | 2016-03-31 | 2019-05-10 | 上海天马有机发光显示技术有限公司 | Driving circuit, organic electroluminescent LED display and driving method |
| EP3472693B1 (en) | 2016-06-17 | 2021-12-15 | BOE Technology Group Co., Ltd. | Touch display substrate, touch display apparatus having the same, pixel arrangement, and fabricating method thereof |
| CN106023891B (en) * | 2016-07-22 | 2018-05-04 | 京东方科技集团股份有限公司 | A kind of image element circuit, its driving method and display panel |
| CN107731156B (en) | 2016-08-12 | 2020-02-21 | 京东方科技集团股份有限公司 | Compensation pixel circuit, display panel, display device, compensation and driving method |
| KR102526355B1 (en) * | 2016-09-22 | 2023-05-02 | 엘지디스플레이 주식회사 | Organic Light Emitting Display Device |
| CN106297672B (en) * | 2016-10-28 | 2017-08-29 | 京东方科技集团股份有限公司 | Pixel-driving circuit, driving method and display device |
| CN106409231B (en) * | 2016-10-31 | 2018-10-12 | 昆山国显光电有限公司 | A kind of luminance compensation method, device and display equipment |
| CN106782309A (en) * | 2017-02-23 | 2017-05-31 | 京东方科技集团股份有限公司 | Pixel-driving circuit, the driving method of pixel-driving circuit and display device |
| CN108877664A (en) * | 2017-05-12 | 2018-11-23 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel |
| CN106997747B (en) * | 2017-05-27 | 2019-01-01 | 京东方科技集团股份有限公司 | A kind of organic light emitting display panel and display device |
| CN106971691A (en) | 2017-05-31 | 2017-07-21 | 京东方科技集团股份有限公司 | A kind of image element circuit, driving method and display device |
| US10210799B2 (en) * | 2017-06-28 | 2019-02-19 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Pixel compensation circuit and display device |
| CN107230455A (en) * | 2017-07-21 | 2017-10-03 | 京东方科技集团股份有限公司 | A kind of pixel-driving circuit, image element driving method and display base plate |
| CN107393505B (en) * | 2017-08-07 | 2019-11-08 | 京东方科技集团股份有限公司 | Photosensitive circuit, photosensitive circuit driving method, and display device |
| EP3470773A1 (en) * | 2017-08-14 | 2019-04-17 | Shenzhen Goodix Technology Co., Ltd. | Three-dimensional image system, and electronic device |
| CN107389203B (en) * | 2017-08-23 | 2019-08-02 | 京东方科技集团股份有限公司 | A kind of pixel reading circuit, array reading circuit and pixel read method |
| CN109559679B (en) * | 2017-09-26 | 2024-07-09 | 京东方科技集团股份有限公司 | Touch display panel, driving method thereof, pixel circuit and electronic device |
| CN107945741A (en) * | 2017-11-07 | 2018-04-20 | 深圳市华星光电半导体显示技术有限公司 | OLED pixel drive circuit, array base palte and display device |
| JP7088596B2 (en) * | 2017-12-15 | 2022-06-21 | 京東方科技集團股▲ふん▼有限公司 | AMOLED display panel with image scanning function |
| CN108364607B (en) | 2018-05-25 | 2020-01-17 | 京东方科技集团股份有限公司 | Pixel circuit and driving method thereof, and display device |
| KR102568713B1 (en) * | 2018-10-12 | 2023-08-22 | 삼성디스플레이 주식회사 | Pixel and display device including the same |
| CN110599963A (en) * | 2019-09-25 | 2019-12-20 | 京东方科技集团股份有限公司 | Pixel driving circuit, array substrate, display device and pixel driving method |
| TWI716120B (en) * | 2019-09-25 | 2021-01-11 | 友達光電股份有限公司 | Pixel circuit and display panel |
| CN110992884B (en) * | 2019-12-24 | 2021-07-09 | 武汉天马微电子有限公司 | Display panel, display device and detection compensation method of display panel |
| CN111540303A (en) * | 2020-01-17 | 2020-08-14 | 重庆康佳光电技术研究院有限公司 | Drive circuit and display device |
| CN113439299A (en) * | 2020-01-23 | 2021-09-24 | 京东方科技集团股份有限公司 | Display substrate, driving method thereof and display device |
| CN111584577A (en) * | 2020-05-14 | 2020-08-25 | 深圳市华星光电半导体显示技术有限公司 | Display panel and method of making the same |
| CN114550630A (en) * | 2020-11-24 | 2022-05-27 | 京东方科技集团股份有限公司 | Display panel, driving method thereof and display device |
| CN115881039B (en) * | 2021-09-27 | 2024-09-17 | 乐金显示有限公司 | Pixel circuit and display device including the same |
| CN114267297B (en) | 2021-12-16 | 2023-05-02 | Tcl华星光电技术有限公司 | Pixel compensation circuit and method and display panel |
| CN114299876B (en) * | 2021-12-24 | 2023-08-11 | 京东方科技集团股份有限公司 | Display panel, driving method thereof and display device |
| US12272296B2 (en) * | 2022-01-17 | 2025-04-08 | Samsung Display Co., Ltd. | Display device |
| CN115862540B (en) | 2023-03-02 | 2023-05-26 | 惠科股份有限公司 | Pixel driving circuit, pixel driving method and display panel |
| KR20250007305A (en) * | 2023-07-05 | 2025-01-14 | 삼성전자주식회사 | Display device |
| CN117854434B (en) * | 2024-02-08 | 2024-05-24 | 惠科股份有限公司 | Pixel compensation circuit, pixel circuit, display device and pixel compensation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1567416A (en) * | 2003-06-30 | 2005-01-19 | 胜华科技股份有限公司 | Current driving device and method for active organic light emitting diode |
| CN102194407A (en) * | 2010-03-11 | 2011-09-21 | 精工爱普生株式会社 | Light emitting device, electronic apparatus, and method of driving light emitting device |
| CN103268753A (en) * | 2013-05-28 | 2013-08-28 | 上海中科高等研究院 | AMOLED driving circuit shared by scanning lines and its driving method |
| CN203480810U (en) * | 2013-09-06 | 2014-03-12 | 京东方科技集团股份有限公司 | Pixel circuit and displayer |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060054603A (en) * | 2004-11-15 | 2006-05-23 | 삼성전자주식회사 | Display device and driving method thereof |
| KR101322002B1 (en) * | 2008-11-27 | 2013-10-25 | 엘지디스플레이 주식회사 | Liquid Crystal Display |
| CN101826300A (en) | 2010-03-30 | 2010-09-08 | 汕头超声显示器（二厂）有限公司 | Active display device and driving method thereof |
| KR101693693B1 (en) | 2010-08-02 | 2017-01-09 | 삼성디스플레이 주식회사 | Pixel and Organic Light Emitting Display Device Using the same |
| TWI471841B (en) * | 2011-11-11 | 2015-02-01 | Wintek Corp | Organic light emitting diode pixel circuit and driving circuit thereof and applications using the same |
| KR101950846B1 (en) * | 2012-12-20 | 2019-02-22 | 엘지디스플레이 주식회사 | Light emitting diode display device |
| CN103150991A (en) * | 2013-03-14 | 2013-06-12 | 友达光电股份有限公司 | A pixel compensation circuit for AMOLED display |
| CN104078004B (en) * | 2014-06-18 | 2016-08-31 | 京东方科技集团股份有限公司 | Image element circuit and display device |
| CN104091559B (en) * | 2014-06-19 | 2016-09-14 | 京东方科技集团股份有限公司 | Image element circuit and driving method, display device |
-
2014
- 2014-07-07 CN CN201410321351.2A patent/CN104134426B/en active Active
- 2014-10-11 EP EP14882770.2A patent/EP3168832A4/en not_active Withdrawn
- 2014-10-11 US US14/778,848 patent/US9972248B2/en active Active
- 2014-10-11 WO PCT/CN2014/088396 patent/WO2016004690A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1567416A (en) * | 2003-06-30 | 2005-01-19 | 胜华科技股份有限公司 | Current driving device and method for active organic light emitting diode |
| CN102194407A (en) * | 2010-03-11 | 2011-09-21 | 精工爱普生株式会社 | Light emitting device, electronic apparatus, and method of driving light emitting device |
| CN103268753A (en) * | 2013-05-28 | 2013-08-28 | 上海中科高等研究院 | AMOLED driving circuit shared by scanning lines and its driving method |
| CN203480810U (en) * | 2013-09-06 | 2014-03-12 | 京东方科技集团股份有限公司 | Pixel circuit and displayer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104134426A (en) | 2014-11-05 |
| EP3168832A1 (en) | 2017-05-17 |
| WO2016004690A1 (en) | 2016-01-14 |
| US9972248B2 (en) | 2018-05-15 |
| US20160155385A1 (en) | 2016-06-02 |
| EP3168832A4 (en) | 2018-03-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104134426B (en) | Pixel structure and driving method thereof, and display device | |
| CN110176213B (en) | Pixel circuit, driving method thereof and display panel | |
| CN103218970B (en) | Active matrix organic light emitting diode (AMOLED) pixel unit, driving method and display device | |
| JP6621766B2 (en) | Pixel circuit, driving method thereof, and display device | |
| CN105702206B (en) | A kind of offset peripheral system and method, the display system of picture element matrix | |
| CN109887464B (en) | Pixel circuit, driving method thereof, display panel and display device | |
| US9880654B2 (en) | Touch display drive circuit, touch display drive method and display device | |
| CN104217677B (en) | touch display circuit and display device | |
| CN104680980B (en) | Pixel driving circuit, driving method thereof and display device | |
| US9218766B2 (en) | Pixel unit circuit, pixel array, display panel and display panel driving method | |
| KR101581147B1 (en) | Sensing circuit for external compensation, sensing method thereof and display apparatus | |
| CN103258501B (en) | Pixel circuit and driving method thereof | |
| US9601050B2 (en) | External compensation sensing circuit and sensing method thereof, display device | |
| US10642389B2 (en) | Touch display driving circuit, touch display apparatus | |
| US20200082756A1 (en) | Display Panel, Display Device and Compensation Method | |
| US20180197472A1 (en) | Driving method for preventing image sticking of display panel upon shutdown, and display device | |
| CN104318898A (en) | Pixel circuit, driving method and display device | |
| US20180247592A1 (en) | Pixel Driving Circuit and Driving Method Thereof, Array Substrate, and Display Device | |
| US20210365145A1 (en) | Pixel Circuit, Array Substrate, Display Panel and Method of Driving the Same, and Display Device | |
| CN104537984B (en) | Pixel circuit and driving method thereof | |
| CN203179475U (en) | Amoled pixel unit and display device | |
| CN202957021U (en) | Pixel unit driving circuit and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |